Problems with Open-Source Downloads read and

QTimer with QProgressbar

  • Hi,

    I am trying to make my progressbar flow by time so I connected a progressbar to a QTimer. Here is my code:

    void MainWindow::progressbarTimer(QString TimeSet)
        QTimer *timer = new QTimer(this);
        currenttime = TimeSet.toInt();
        connect(timer, SIGNAL(timeout()), this, SLOT(updateProgresbar()));
    void MainWindow::updateProgresbar()
        if(counter <= currenttime*1000)
            delete timer;

    Unfortunately I can't seem to input parameters into the updateProgresbar slot to make use of the timer in the function. Anyone got a solution for this? Thanks in advance!

  • Lifetime Qt Champion


    You declare timer in progressbarTimer so it's not the same as the one you have in updateProgresbar.

  • @SGaist Hi, thanks for your reply. I know it is not the same. My question is how I can get it the same.

  • Hio,
    What SGaist said is that your timer (QTimer) in void MainWindow::progressbarTimer() has function scope. So when you end the function, the timer variable is no longer available. Because you don't delete it and it has a signal/slot connection the timer is still active in the eventloop. So calling the updateProgressBar is no problem. To reference again to that timer is not valid!! the timer-> will give errors??

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